fix(i18n): complete translations for production launch and fix CMS store context

- Replace CMS custom get_store_context() with core utility (same fix as loyalty)
- Add 85 missing translation keys across fr/de/lb for core, tenancy, messaging,
  customers, and loyalty modules
- Convert 21 client-side $t() calls to server-side _() in 9 loyalty templates
- Fix 3 broken translation keys in store/cards.html

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/modules/cms/routes/pages/store.py

@@ -20,7 +20,8 @@ from app.modules.cms.services import content_page_service
 from app.modules.core.services.platform_settings_service import (
     platform_settings_service,  # MOD-004 - shared platform service
 )
-from app.modules.tenancy.models import Store, User
+from app.modules.core.utils.page_context import get_store_context
+from app.modules.tenancy.models import User
 from app.templates_config import templates
 
 logger = logging.getLogger(__name__)
@@ -33,54 +34,6 @@ ROUTE_CONFIG = {
 }
 
 
-# ============================================================================
-# HELPER: Build Store Dashboard Context
-# ============================================================================
-
-
-def get_store_context(
-    request: Request,
-    db: Session,
-    current_user: User,
-    store_code: str,
-    **extra_context,
-) -> dict:
-    """
-    Build template context for store dashboard pages.
-
-    Resolves locale/currency using the platform settings service with
-    store override support.
-    """
-    # Load store from database
-    store = db.query(Store).filter(Store.subdomain == store_code).first()
-
-    # Get platform defaults
-    platform_config = platform_settings_service.get_storefront_config(db)
-
-    # Resolve with store override
-    storefront_locale = platform_config["locale"]
-    storefront_currency = platform_config["currency"]
-
-    if store and store.storefront_locale:
-        storefront_locale = store.storefront_locale
-
-    context = {
-        "request": request,
-        "user": current_user,
-        "store": store,
-        "store_code": store_code,
-        "storefront_locale": storefront_locale,
-        "storefront_currency": storefront_currency,
-        "dashboard_language": store.dashboard_language if store else "en",
-    }
-
-    # Add any extra context
-    if extra_context:
-        context.update(extra_context)
-
-    return context
-
-
 # ============================================================================
 # CONTENT PAGES MANAGEMENT
 # ============================================================================